JPH02146992A - Controller for motor - Google Patents

Controller for motor

Info

Publication number
JPH02146992A
JPH02146992A JP63299007A JP29900788A JPH02146992A JP H02146992 A JPH02146992 A JP H02146992A JP 63299007 A JP63299007 A JP 63299007A JP 29900788 A JP29900788 A JP 29900788A JP H02146992 A JPH02146992 A JP H02146992A
Authority
JP
Japan
Prior art keywords
motor
cpu
load current
value
time
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP63299007A
Other languages
Japanese (ja)
Inventor
Chukichi Mukai
向井 忠吉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP63299007A priority Critical patent/JPH02146992A/en
Publication of JPH02146992A publication Critical patent/JPH02146992A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00Programme-control systems
    • G05B19/02Programme-control systems electric
    • G05B19/18Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/406Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by monitoring or safety
    • G05B19/4062Monitoring servoloop, e.g. overload of servomotor, loss of feedback or reference

Landscapes

  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

PURPOSE:To prevent a motor from burning out by detecting, the continued overload state to stop the motor if a load current value is at an overcurrent detecting level or less. CONSTITUTION:When an acceleration control is operated, the value Lb of a load current detected by a resistor R is input to the CPU 3 of a controller 2 through a protective circuit 6, and compared with a preset overcurrent stall preventing level La. In case of La<Lb in the comparison, the CPU 3 operates adding counting of an inner timer to count time of continuation of La<Lb. When it becomes La>=Lb on the way of adding counting, the CPU 3 operates subtracting counting of the timer. Thus, the timer is operated on the basis of the comparison result, and when the integrated value becomes a predetermined time or more, it is judged as a malfunction. If a load current value Lb becomes overcurrent detection level Lt or more while stroke preventing function is operated, it is judged as malfunction. When the malfunction is judged, the CPU 3 forcibly stops the operation of an induction motor IM.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は電動機の制御装置に関するものである。[Detailed description of the invention] [Industrial application field] The present invention relates to a control device for an electric motor.

[従来の技術] 従来、電動機の過負荷時の停止制御を行う場合には、過
電流検知レベルを設定して、この過電流検知レベルを負
′R電流値が越えた時に電動機を停止させる制御装置が
あった。
[Prior Art] Conventionally, when performing stop control in the event of an overload of a motor, an overcurrent detection level is set, and control is performed to stop the motor when the negative R current value exceeds this overcurrent detection level. There was a device.

[発明が解決しようとする課題] しかしながら上記従来例では過電流検知レベルに近い電
流で連続運転された場合には制御装置が異常と判定しな
いため、電動機が過熱して焼損に至ることがあった9 また電動機の過負荷保護の為には制御装置と電動機との
間にサーマルリレーを入れるか制御装置内部で新たに検
出、比較部を構成する必要があった。
[Problems to be Solved by the Invention] However, in the conventional example described above, if the motor is continuously operated at a current close to the overcurrent detection level, the control device does not determine that there is an abnormality, so the motor may overheat and burn out. 9. Also, in order to protect the motor from overload, it was necessary to insert a thermal relay between the control device and the motor, or to configure a new detection and comparison section within the control device.

本発明は上述の問題点に鑑みて為されたもので5その目
的とするところは過電流検知レベル以下であっても電動
機が過負荷運転状態を継続した場合に電動機の運転を停
止させて電動機の焼損を防止できる電動機の制御装置を
提供するにある。
The present invention has been made in view of the above-mentioned problems, and its purpose is to stop the operation of the motor when the motor continues to operate under overload even if the current is below the overcurrent detection level. An object of the present invention is to provide a control device for an electric motor that can prevent burnout.

[課題を解決するための手段] 本発明は電動機を駆動するインバータ回路と、インバー
タ回路を制御する制御回路とがらなり、制御回路には電
動機に流れる負荷電流を検知する検知手段と、予め設定
した過電流検知レベルより低く設定した過電流失速防止
検知レベルを負荷電流値が連続して越えている時間を加
算4時し、上記負荷電流値が上記過電流失速防止検知レ
ベルを連続して越えていない時間を上記加算計時の値か
ら零の値に至るまでの範囲で減算計時するタイマ手段と
、このタイマ手段の積算計時値が一定時間を越えると電
動機の運転を停止させる比較制御手段とを備えたもので
ある。
[Means for Solving the Problems] The present invention consists of an inverter circuit that drives an electric motor and a control circuit that controls the inverter circuit. Add up the time during which the load current value continuously exceeds the overcurrent stall prevention detection level, which is set lower than the current detection level, and the load current value does not continuously exceed the overcurrent stall prevention detection level. A timer means for subtracting time in a range from the above-mentioned addition time value to a value of zero, and a comparison control means for stopping the operation of the electric motor when the cumulative time value of the timer means exceeds a certain time. It is something.

[作用] 而して本発明の電動機の制御装置は過電流検知レベル以
下であっても電動機の過負荷状態が継続した場&にはこ
れを検知して電動機の運転を停止させ、電動機の焼損を
未然に防止できるのである。
[Function] Therefore, the motor control device of the present invention detects if the overload state of the motor continues even if the current is below the overcurrent detection level and stops the operation of the motor, thereby preventing burnout of the motor. It is possible to prevent this from happening.

[実施例] 第1図は本発明の電動機の制御装置の実施例の回路を示
しており、この実施例装置では電動機の駆動手段として
インバータ回路1を用いており、このインバー・夕回路
1を制御回路2かへのオン7/オフ指令でスイッチング
素子Q1〜Q6のスイッチングを制御して誘導電動機I
Mの回転を制御するものである。制御回路2は総て1チ
ツプのマイクロコンピュータ(以下CPUと略す)3に
より管理され運転スイッチSW4 (SW4’ )の信
号を受けて予め内蔵RAM3aに記憶した周波数設定デ
ータ或はシーケンサのような外部制御装置や可変抵抗器
VRのような基準入力源からの周波数設定データに基づ
いてオン/オフ指令信号U、V、Wを出力するようにな
っている。また制御回路2はスイッチSW1〜SW、の
信号で制御条件、つまり制御プログラムが設定せられ、
これら設定条件を表示部LED、、LED、に表示する
とともにEEPROM5に書き込む動作を行い、更にま
た異常時には保護回路6からの異常原因信号を判別した
り、或はCP LJ B自体の異常判定に基づいて表示
部L E D I、 L E D 2にて異常表示を行
うとともに、異常内容をEEPROM5に書き込み又同
時に主回路の主接点Sを引き外す遮断リレー7に遮断動
作させるための異常信号STを出力するのである。
[Embodiment] FIG. 1 shows a circuit of an embodiment of the motor control device of the present invention. In this embodiment, an inverter circuit 1 is used as a drive means for the motor. The induction motor I controls the switching of the switching elements Q1 to Q6 by on/off commands to the control circuit 2.
This controls the rotation of M. The control circuit 2 is entirely managed by a one-chip microcomputer (hereinafter abbreviated as CPU) 3, which receives a signal from the operation switch SW4 (SW4') and uses frequency setting data stored in a built-in RAM 3a in advance or external control such as a sequencer. On/off command signals U, V, and W are output based on frequency setting data from a reference input source such as a device or a variable resistor VR. In addition, the control circuit 2 has control conditions, that is, control programs, set by signals from the switches SW1 to SW.
These setting conditions are displayed on the display unit LED, , LED, and written into the EEPROM 5. Furthermore, in the event of an abnormality, the abnormality cause signal from the protection circuit 6 is determined, or based on the abnormality judgment of the CP LJ B itself. At the same time, the abnormality is displayed on the display parts LED I and LED2, and the contents of the abnormality are written to the EEPROM 5. At the same time, the abnormality signal ST is sent to the cutoff relay 7, which trips the main contact S of the main circuit, to perform the cutoff operation. It outputs.

次に電動機の制御装置の基本的動作について第2図のフ
ローチャートにより説明する。
Next, the basic operation of the electric motor control device will be explained with reference to the flowchart shown in FIG.

まず装置の3相交流電源ACを投入して電源回路(図示
せず)から制御回路2に直流電源Vccを供給すると、
CP U 3は内蔵プログラムにより動作を開始し、ま
ず内蔵RAM3aの記憶内容を一旦クリアして初期化を
図る。この初期化後、EEPROM5に記憶されている
前回動作条件や最終異常内容等のデータを読み込んで内
蔵RA M 3aに書き込む。つまり初期データの読み
込みを行う。
First, when the three-phase AC power supply AC of the device is turned on and the DC power supply Vcc is supplied from the power supply circuit (not shown) to the control circuit 2,
The CPU 3 starts operating according to a built-in program, and first clears the stored contents of the built-in RAM 3a for initialization. After this initialization, the data stored in the EEPROM 5, such as the previous operating conditions and the details of the final abnormality, are read and written into the built-in RAM 3a. In other words, initial data is loaded.

次いでCPU3はモード判定を行うが、この場合初期状
態であるからモード“00”と判定する。
Next, the CPU 3 makes a mode determination, and in this case, since it is the initial state, it determines the mode to be "00".

この時表示部1.、、 E D lは”00”と表示さ
れている。モードが”00”と判定されると、表示部L
ED2に”000”をドライバー(図示せず)を通じて
駆動表示する。ここでモードとしては回転数の上昇(加
速制611)、下降(減速制御)、定速制御、PWM制
御のV/F比、ブレーキ時間、最高周波数を設定するプ
ログラム設定モード等があり、モード設定用のモードス
イッチSW1を操作することにより順次切り替え設定で
きるのである9図示するモード判定はプログラム設定モ
ードの判定のみだけであるが、勿論的のモード判定を行
うルーチンを備えている。
At this time, display section 1. ,,EDI is displayed as "00". If the mode is determined to be “00”, the display L
"000" is driven and displayed on ED2 through a driver (not shown). Here, the modes include increase in rotation speed (acceleration control 611), decrease (deceleration control), constant speed control, program setting mode to set the V/F ratio of PWM control, braking time, maximum frequency, etc. The mode determination shown in FIG. 9 only determines the program setting mode, but it is of course equipped with a routine for making mode determination.

さて上記初期表示状態(モードナンバーが00”)に於
いて誘導電動機IMを起動させることができる。
Now, in the above-mentioned initial display state (mode number is 00''), the induction motor IM can be started.

つまり設定条件を変更しなければ萌四の設定条件により
インバータ回路1を制御して誘導電動機IMを駆動させ
ることができる。ここでモードスイッチSW、の操作に
基づいて現在モードナンバーに「1」プラスしたモード
に進み、このモードに対応した現在の設定データを内蔵
RAM3aから読み出して表示部L E D 2に3桁
の数字で表示させ且つ表示部LED、にモードナンバー
を表示させる。そして現在表示部LED2で表示されて
いる設定条件を変更する場合にはデータ設定用のデータ
スイッチSW2を操作すれば良く、この場合CPU3は
同一モード内の次の設定条件のデータを登録しているC
PU3の内蔵RAM3aから読み出し、その内容を表示
部LED2により表示させる。
In other words, if the setting conditions are not changed, the inverter circuit 1 can be controlled to drive the induction motor IM according to the setting conditions of Moeshi. Based on the operation of the mode switch SW, the mode advances to the mode in which "1" is added to the current mode number, the current setting data corresponding to this mode is read from the built-in RAM 3a, and a 3-digit number is displayed on the display section L E D 2. and display the mode number on the display unit LED. If you want to change the setting conditions currently displayed on the display LED 2, you only need to operate the data switch SW2 for data setting. In this case, the CPU 3 registers the data of the next setting condition in the same mode. C
The contents are read from the built-in RAM 3a of the PU 3 and displayed on the display unit LED 2.

そしてこの表示内容が所望の設定条件であれば使用者は
記憶スイッチSW、を操作すれば良い。
If the displayed contents meet the desired setting conditions, the user only has to operate the memory switch SW.

この記憶スイッチSW、は条件確定のスイッチであって
、該スイッチSW、が投入されるとCPU3は上記の変
更の為に読み出した所定のモードの設定条件のデータに
、内蔵RAM3a及びEEPROM5に書き込まれてい
る当該モードのデータを書き換える。この書き換えが終
了するとモード判定状態となる。つまりプログラム設定
は各条件設定毎に完了することになっており、各条件設
定や訂正を行う場合には次のように繰り返せば良い。
This memory switch SW is a switch for determining conditions, and when this switch SW is turned on, the CPU 3 writes the data of the setting conditions of the predetermined mode read for the above change into the built-in RAM 3a and EEPROM 5. Rewrite the data for the mode in question. When this rewriting is completed, a mode determination state is entered. In other words, the program setting is to be completed for each condition setting, and when setting or correcting each condition, it is sufficient to repeat the following steps.

もし上記データスイッチSW2の操作により表示させた
設定条件が所望の条件でなければ、記憶スイッチSW3
を操作せず、所望の設定条件となるまで、繰り返してデ
ータスイッチSW2を操作すれば良い8才な条件変更を
止めたい場合には記憶スイッチSW、を操作せず、モー
ドスイッチSW1を操作して次のモードの表示へ移行さ
せれば良い、所定モードの設定条件の確認だけを行う場
合には、設定スイッチSW1の操作を繰り返すと良く、
この場合モードが順次切り替わり、その度に表示部LE
D、の表示モードナンバーと、表示部L E D 2の
設定条件のデータとが順次切り替え表示される。尚設定
データを初期状態に戻したい場合にはリセットスイッチ
SWsを投入すれば良い。
If the setting conditions displayed by operating the data switch SW2 are not the desired conditions, the memory switch SW3
If you want to stop changing the conditions, operate the mode switch SW1 without operating the memory switch SW. If you only need to move to the display of the next mode or just check the setting conditions of a predetermined mode, it is better to repeat the operation of the setting switch SW1.
In this case, the mode changes sequentially, and each time the display section LE
The display mode number D and the setting condition data of the display section LED2 are sequentially switched and displayed. Incidentally, if it is desired to return the setting data to the initial state, it is sufficient to turn on the reset switch SWs.

而して順次各設定条件の変更(又は確認)が終了すれば
、この終了時点で運転スイッチSW、によって起動可能
な状態になるわけである。さてモード”00”の起動可
能な状態で運転スイッチSW、又は遠隔制御用端子に接
続されている運転スイッチsw、’が投入されていると
すると、CPU3はこの投入を感知して内蔵RAM3a
に書き込まれた設定条件或は可変抵抗器VR(又は外部
制御装置)からの周波数設定信号に基づいてオン/オフ
指令信号U、V、Wを出力する。つまり加速制御、定速
制御、減速制御をプログラム設定に基づいて行う制御動
作に移行する。
When the changing (or checking) of each set condition is completed in sequence, the system can be activated by operating the operation switch SW. Now, assuming that the operation switch SW, or the operation switch SW,' connected to the remote control terminal is turned on in the startable state of mode "00", the CPU 3 senses this turning on and stores the built-in RAM 3a.
On/off command signals U, V, and W are output based on the setting conditions written in or the frequency setting signal from the variable resistor VR (or external control device). In other words, the control operation shifts to acceleration control, constant speed control, and deceleration control based on the program settings.

勿論基準入力源か、内蔵RAM3aのデータかを選択す
るのは動作モードの設定によって判断する。
Of course, the selection between the reference input source and the data in the built-in RAM 3a is determined by the setting of the operation mode.

さて上記指令信号U、V、Wはインバータ回路10のペ
ースドライバー4を介してスイッチング素子Q+〜Q6
をスイッチングさせて3層誘導電動機IMを駆動させる
Now, the above command signals U, V, W are sent to the switching elements Q+ to Q6 via the pace driver 4 of the inverter circuit 10.
is switched to drive the three-layer induction motor IM.

この駆動時の運転周波数はCPU3の制御の下で表示部
L E D 2により表示される。
The operating frequency during this drive is displayed on the display section LED2 under the control of the CPU3.

次に誘導電動機IMに過負荷等の異常状態が発生すれば
付加電流が増加する。この増加によって検出用抵抗Rの
両端電圧の上昇し、この上昇が保護回路6で検出される
と保護回路6から異常検出信号が出力してCPU3に異
常割り込み信号を与える。この割り込みによりCPU3
は動作モードを異常割り込みルーチンに飛ばし、異常処
理動作に移る。
Next, if an abnormal condition such as overload occurs in the induction motor IM, the additional current increases. This increase causes the voltage across the detection resistor R to rise, and when this rise is detected by the protection circuit 6, an abnormality detection signal is output from the protection circuit 6 and an abnormality interrupt signal is given to the CPU 3. This interrupt causes CPU3
skips the operating mode to the abnormal interrupt routine and moves to the abnormal handling operation.

つまり異常割り込みルーチンへ飛んだCPU3はオン/
オフ指令信号U、V、Wの出力を停止し、誘導電動機I
Mの運転を停止させるとともに、同時に異常信号STを
発生させ、この異常信号STにより電源回路に挿入しで
ある遮断リレー7の接点Sをオフさせて誘導電動機IM
への電源供給を停める。一方この間に制御回路2のCP
U3は保護回路6から一旦内蔵RAM3aに書き込んで
ある異常データをEEPROM5の異常データ書き込み
アドレスに書き込むとともに、該異常データに基づいて
表示部LED2に異常内容を表示させ、この表示をリセ
ット用スイッチSWsの操作があるまで維持する。又制
御回路2の電源供給も完全に停止されると、装置全体の
動作が完全に停まることになる。
In other words, CPU3 that jumps to the abnormal interrupt routine is turned on/
The output of the off command signals U, V, and W is stopped, and the induction motor I
At the same time, an abnormal signal ST is generated, and the abnormal signal ST turns off the contact S of the cut-off relay 7 inserted into the power supply circuit, and the induction motor IM is stopped.
Stop the power supply to. Meanwhile, during this time, the CP of control circuit 2
U3 writes the abnormal data that has been written in the built-in RAM 3a from the protection circuit 6 to the abnormal data writing address of the EEPROM 5, and also displays the abnormal contents on the display unit LED 2 based on the abnormal data, and switches this display to the reset switch SWs. Maintain until operated. Furthermore, if the power supply to the control circuit 2 is also completely stopped, the operation of the entire device will be completely stopped.

上記異常表示時にリセットスイッチSWSを投入するか
或は装置の動作停止後に再度電源を投入すると、CPU
3は初期状態に設定され、EEFROM5の書き込まれ
ている制御条件のデータ及び異常内容のデータを内蔵R
AM3aに転送させる。この転送後に再起動させると、
上記異常が解消していない場合には保護回路6により異
常が検出されて上述の割り込みが起き、上述の異常割り
込みルーチンへ飛ぶわけであるが、モード判定時におい
て、スイッチSWlを操作し異常表示モードに設定する
と、前回の動作時に起きた異常内容が表示部L E D
 、に表示される。使用者はこの表示部LED2の表示
により異常原因の再確認ができる。
If you turn on the reset switch SWS when the above abnormality is displayed, or turn on the power again after the device has stopped operating, the CPU
3 is set to the initial state and contains data of control conditions written in EEFROM 5 and data of abnormality contents.
Transfer to AM3a. If you restart after this transfer,
If the above-mentioned abnormality has not been resolved, the protection circuit 6 detects the abnormality, causes the above-mentioned interrupt, and jumps to the above-mentioned abnormality interrupt routine.However, when determining the mode, switch SWl is operated to switch to the abnormality display mode. When set to , the details of the abnormality that occurred during the previous operation will be displayed on the display L E D
, will be displayed. The user can reconfirm the cause of the abnormality based on the display on the display section LED2.

ところで誘導電動機IMの回転数を上昇させる加速制御
過程ではインバータ回路1の出力信号の周波数を徐々に
高くするようにインバータ回路1は制御回路2によって
制御されるわけであるが、加速時間と負荷慣性とがマツ
チしないで負荷電流の値が増加することがある。このと
き制御回路2は一時的に周波数の変化(丘昇率)を小さ
くし、負荷の追従を待つストロール防止機能を働かせて
インバータ回路1を制御する。このストロール防止機能
を動かせる負荷電流値は過電流検知レベルより低いレベ
ルに設定しており、この負荷電流レベルを過電流失速防
止レベルLaとしている。
By the way, in the acceleration control process to increase the rotational speed of the induction motor IM, the inverter circuit 1 is controlled by the control circuit 2 so as to gradually increase the frequency of the output signal of the inverter circuit 1. The value of load current may increase without matching. At this time, the control circuit 2 temporarily reduces the frequency change (hill rise rate) and controls the inverter circuit 1 by activating the anti-stroll function that waits for the load to follow. The load current value at which this stall prevention function can be activated is set to a level lower than the overcurrent detection level, and this load current level is defined as the overcurrent stall prevention level La.

第3図は上述の加速制御のルーチンを示しCおり、加速
制御に移ると、抵抗Rで検出した負荷電流の値l−bを
保護回路6を通じて制御回路2のCPU3は取り込み、
予め設定しである過電流失速防止レベルL aと比較す
る。この比較がL a < L、bであればCPU3は
内蔵タイマを加算計時動作させてL a < L bの
連続している時間を計時する。
FIG. 3 shows the above-mentioned acceleration control routine. When the acceleration control starts, the CPU 3 of the control circuit 2 takes in the load current value lb detected by the resistor R through the protection circuit 6.
It is compared with a preset overcurrent stall prevention level La. If this comparison shows that La<L,b, the CPU 3 causes the built-in timer to operate as an addition timer to measure the continuous time when La<Lb.

また加算計時途中で比較結果がL a≧LbとなるとC
PU3は内蔵タイマを減算計時動作させる。
Also, if the comparison result becomes L a ≧ Lb during addition time measurement, C
PU3 causes the built-in timer to perform subtractive timing operation.

このようにして比較結果に基づいて内蔵タイマを動作さ
せ、その積算値が一定時間′r、例えば60sec以上
となると異常と判定し、60secより小さければスト
ロール防止機能を継続して働かせる。またストロール防
止機能を働かしている間に負荷電流値Lbが過電検知レ
ベルL を以上となると、異常と判定する。異常と判定
した場合にはCPU3は動作モードを上述した異常割り
込みルーチン飛ばし、誘導電動fiIMの運転を強制的
に停止させるのである。
In this way, a built-in timer is operated based on the comparison result, and if the integrated value exceeds a certain period of time, for example, 60 seconds, it is determined that there is an abnormality, and if it is less than 60 seconds, the anti-stroll function continues to operate. Furthermore, if the load current value Lb exceeds the overcurrent detection level L while the anti-stroll function is activated, it is determined that an abnormality has occurred. If it is determined that there is an abnormality, the CPU 3 skips the above-mentioned abnormality interrupt routine and forcibly stops the operation of the induction electric fiIM.

[発明の効果] 本発明は電動機を駆動するインバータ回路と、インバー
タ回路を制御する制御回路とからなり、制御回路には電
動機に流れる負荷電流を検知する検知手段と、予め設定
した過電流検知レベルより低く設定した過電流失速防止
検知レベルを負荷電流値が連続して越えている時間を加
算計時し、上記負荷電流値が上記過電流失速防止検知レ
ベルを連続して越えていない時間を上記加算計時の値が
ら零の値に至るまでの範囲で減算計時するタイマ手段と
、このタイマ手段の積算計時値が一定時間を越えると電
動機の運転を停止させる比較制御手段とを備えなので、
負荷電流値が過電流検知レベル以下であっても電動機の
過負荷状態が継続した場合にはこれを検知して電動機の
運転を停止させることができ、結果電動機の焼損を未然
に防止することができるという効果を奏する。
[Effects of the Invention] The present invention includes an inverter circuit that drives an electric motor, and a control circuit that controls the inverter circuit, and the control circuit includes a detection means that detects a load current flowing through the electric motor, and a preset overcurrent detection level. Add and measure the time during which the load current value continuously exceeds the overcurrent stall prevention detection level set lower, and add the time during which the load current value does not continuously exceed the overcurrent stall prevention detection level. It is equipped with a timer means for subtracting time in the range from the time value to a value of zero, and a comparison control means for stopping the operation of the electric motor when the cumulative time value of the timer means exceeds a certain period of time.
Even if the load current value is below the overcurrent detection level, if the motor continues to be overloaded, this can be detected and the motor operation can be stopped, thereby preventing motor burnout. It has the effect of being able to do it.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の実施例の回路構成図、第2図、第3図
は同上の動作説明用フローチャー1・である。 IMは誘導電動機、1はインバータ回路、2は制御回路
、3はCPU、3aは内蔵RAMである。 代理人 弁理士 石 1)長 七
FIG. 1 is a circuit configuration diagram of an embodiment of the present invention, and FIGS. 2 and 3 are a flowchart 1 for explaining the operation of the same. IM is an induction motor, 1 is an inverter circuit, 2 is a control circuit, 3 is a CPU, and 3a is a built-in RAM. Agent Patent Attorney Ishi 1) Choshichi

Claims (1)

【特許請求の範囲】[Claims] (1)電動機を駆動するインバータ回路と、インバータ
回路を制御する制御回路とからなり、制御回路には電動
機に流れる負荷電流を検知する検知手段と、予め設定し
た過電流検知レベルより低く設定した過電流失速防止検
知レベルを負荷電流値が連続して越えている時間を加算
計時し、上記負荷電流値が上記過電流失速防止検知レベ
ルを連続して越えていない時間を上記加算計時の値から
零の値に至るまでの範囲で減算計時するタイマ手段と、
このタイマ手段の積算計時値が一定時間を越えると電動
機の運転を停止させる比較制御手段とを備えたことを特
徴とする電動機の制御装置。
(1) Consists of an inverter circuit that drives the motor and a control circuit that controls the inverter circuit. The time during which the load current value continuously exceeds the current stall prevention detection level is added and counted, and the time during which the load current value does not continuously exceed the overcurrent stall prevention detection level is zeroed from the above added time value. timer means for counting subtractive time in a range up to the value of;
A control device for an electric motor, characterized in that it comprises comparison control means for stopping operation of the electric motor when the cumulative time value of the timer means exceeds a predetermined time.
JP63299007A 1988-11-25 1988-11-25 Controller for motor Pending JPH02146992A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63299007A JPH02146992A (en) 1988-11-25 1988-11-25 Controller for motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63299007A JPH02146992A (en) 1988-11-25 1988-11-25 Controller for motor

Publications (1)

Publication Number Publication Date
JPH02146992A true JPH02146992A (en) 1990-06-06

Family

ID=17867026

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63299007A Pending JPH02146992A (en) 1988-11-25 1988-11-25 Controller for motor

Country Status (1)

Country Link
JP (1) JPH02146992A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0589668A1 (en) * 1992-09-21 1994-03-30 Pitney Bowes Inc. DC motor stall-detection system
JPH06253577A (en) * 1993-03-02 1994-09-09 Ckd Corp Motor controller
JP2006325319A (en) * 2005-05-18 2006-11-30 Ricoh Co Ltd Brushless motor driver and image forming apparatus
ITPI20090002A1 (en) * 2009-01-19 2010-07-20 Paolo Maria Gianoglio SAFETY DEVICE FOR MACHINE TOOLS
JP2010268624A (en) * 2009-05-15 2010-11-25 Denso Corp Servo motor control circuit

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0589668A1 (en) * 1992-09-21 1994-03-30 Pitney Bowes Inc. DC motor stall-detection system
JPH06253577A (en) * 1993-03-02 1994-09-09 Ckd Corp Motor controller
JP2006325319A (en) * 2005-05-18 2006-11-30 Ricoh Co Ltd Brushless motor driver and image forming apparatus
ITPI20090002A1 (en) * 2009-01-19 2010-07-20 Paolo Maria Gianoglio SAFETY DEVICE FOR MACHINE TOOLS
JP2010268624A (en) * 2009-05-15 2010-11-25 Denso Corp Servo motor control circuit
US8710787B2 (en) 2009-05-15 2014-04-29 Denso Corporation Servomotor control circuit

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